Camera Binding not Working
I might have had a similar scenario a few days ago, though I think a bit more info would help. What happens is that you have to make sure that you have actively selected the marker that you will assign the camera to (the marker should be glowing orange). If you don't do this, it will just assign the camera to whichever marker is currently selected (in your screenshot that would be the first marker), overwriting any previous assignments of other cameras.